/* ================================
   FastGPT SEM Landing Page Styles
   主色调: #326DFF (蓝色)
   渐变: #326DFF -> #8EAEFF
   ================================ */

/* CSS 变量 */
:root {
    --primary-color: #326DFF;
    --primary-light: #8EAEFF;
    --primary-gradient: linear-gradient(135deg, #326DFF 0%, #8EAEFF 100%);
    --text-dark: #111824;
    --text-gray: #5A6577;
    --text-light: #8B95A5;
    --bg-white: #FFFFFF;
    --bg-light: #F7F9FC;
    --bg-card: #FFFFFF;
    --border-color: #E5E9F0;
    --shadow-sm: 0 2px 8px rgba(50, 109, 255, 0.08);
    --shadow-md: 0 4px 20px rgba(50, 109, 255, 0.12);
    --shadow-lg: 0 8px 40px rgba(50, 109, 255, 0.15);
    --glow: 0 0 30px rgba(50, 109, 255, 0.2);
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --transition: all 0.3s ease;
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-white);
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ================================
   固定顶部导航 Header
   ================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

/* 滚动后 header 样式变化 */
.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
}

.header-container {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-logo {
    display: flex;
    align-items: center;
}

.header-logo img {
    height: 32px;
    width: auto;
}

.header-cta {
    display: inline-block;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 600;
    color: var(--bg-white);
    background: var(--primary-gradient);
    border: none;
    border-radius: 50px;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.header-cta:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ================================
   首屏 Hero Section - 白色背景版
   ================================ */
.hero {
    min-height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, #ffffff 0%, #f8faff 50%, #f0f4ff 100%);
    position: relative;
    overflow: hidden;
    padding: 200px 20px 60px;
}

/* 背景特效容器 */
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
}

/* 光晕效果 - 白色背景版 */
.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
}

.hero-glow-1 {
    top: -10%;
    left: 10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(50, 109, 255, 0.15) 0%, transparent 70%);
    animation: glowFloat1 15s ease-in-out infinite;
}

.hero-glow-2 {
    top: 20%;
    right: 5%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(142, 174, 255, 0.12) 0%, transparent 70%);
    animation: glowFloat2 18s ease-in-out infinite;
}

@keyframes glowFloat1 {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.8; }
    33% { transform: translate(50px, 30px) scale(1.1); opacity: 1; }
    66% { transform: translate(-30px, 20px) scale(0.9); opacity: 0.7; }
}

@keyframes glowFloat2 {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.7; }
    50% { transform: translate(-60px, 40px) scale(1.15); opacity: 1; }
}

/* 流动光线 SVG */
.hero-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.6;
}

.flow-line {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: flowLine 4s ease-in-out infinite;
}

.flow-line-1 { animation-delay: 0s; }
.flow-line-2 { animation-delay: 1.5s; }
.flow-line-3 { animation-delay: 3s; }

@keyframes flowLine {
    0% {
        stroke-dashoffset: 1000;
        opacity: 0;
    }
    10% { opacity: 0.6; }
    50% {
        stroke-dashoffset: 0;
        opacity: 0.6;
    }
    90% { opacity: 0.6; }
    100% {
        stroke-dashoffset: -1000;
        opacity: 0;
    }
}

.flow-dot {
    opacity: 0.8;
}

/* 浮动粒子 - 白色背景版 */
.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.hero-particles span {
    position: absolute;
    width: 6px;
    height: 6px;
    background: rgba(50, 109, 255, 0.4);
    border-radius: 50%;
    box-shadow: 0 0 15px rgba(50, 109, 255, 0.3);
    animation: particleFloatLight 25s linear infinite;
}

.hero-particles span:nth-child(1) { left: 8%; top: 25%; animation-delay: 0s; animation-duration: 20s; width: 4px; height: 4px; }
.hero-particles span:nth-child(2) { left: 18%; top: 65%; animation-delay: -3s; animation-duration: 25s; width: 5px; height: 5px; }
.hero-particles span:nth-child(3) { left: 32%; top: 35%; animation-delay: -6s; animation-duration: 22s; width: 3px; height: 3px; }
.hero-particles span:nth-child(4) { left: 45%; top: 75%; animation-delay: -9s; animation-duration: 28s; width: 6px; height: 6px; }
.hero-particles span:nth-child(5) { left: 55%; top: 20%; animation-delay: -12s; animation-duration: 24s; width: 4px; height: 4px; }
.hero-particles span:nth-child(6) { left: 68%; top: 55%; animation-delay: -15s; animation-duration: 26s; width: 5px; height: 5px; }
.hero-particles span:nth-child(7) { left: 78%; top: 40%; animation-delay: -18s; animation-duration: 23s; width: 3px; height: 3px; }
.hero-particles span:nth-child(8) { left: 88%; top: 70%; animation-delay: -21s; animation-duration: 27s; width: 4px; height: 4px; }
.hero-particles span:nth-child(9) { left: 25%; top: 85%; animation-delay: -24s; animation-duration: 21s; width: 5px; height: 5px; }
.hero-particles span:nth-child(10) { left: 72%; top: 15%; animation-delay: -27s; animation-duration: 29s; width: 4px; height: 4px; }

@keyframes particleFloatLight {
    0% {
        transform: translateY(0) translateX(0) scale(1);
        opacity: 0;
    }
    5% { opacity: 0.6; }
    50% {
        transform: translateY(-50vh) translateX(30px) scale(0.8);
        opacity: 0.4;
    }
    95% { opacity: 0.6; }
    100% {
        transform: translateY(-100vh) translateX(-20px) scale(1);
        opacity: 0;
    }
}

.hero-container {
    max-width: 1200px;
    width: 100%;
    text-align: center;
    position: relative;
    z-index: 1;
}

/* Logo */
.logo-wrapper {
    margin-bottom: 60px;
}

.logo {
    height: 48px;
    width: auto;
}

/* 主标题 */
.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.hero-title .highlight {
    background: linear-gradient(135deg, #326DFF 0%, #5B8DEF 50%, #326DFF 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 4s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: 24px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 24px;
}

.hero-description {
    font-size: 18px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 50px;
}

/* CTA 按钮 */
.cta-wrapper {
    margin-bottom: 50px;
}

.cta-button {
    display: inline-block;
    padding: 20px 80px;
    font-size: 20px;
    font-weight: 600;
    color: var(--bg-white);
    background: var(--primary-gradient);
    border: none;
    border-radius: 50px;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md), var(--glow);
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(50, 109, 255, 0.3);
}

.cta-button:hover::before {
    left: 100%;
}

/* 信任状 - 独立卡片样式 */
.trust-badges {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 24px;
    flex-wrap: wrap;
    max-width: 900px;
    margin: 0 auto;
}

.trust-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 15px 48px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 30px rgba(50, 109, 255, 0.08);
    border: 1px solid rgba(50, 109, 255, 0.1);
    min-width: 200px;
    flex: 1;
    transition: var(--transition);
}

.trust-card:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(50, 109, 255, 0.2);
    box-shadow: 0 8px 40px rgba(50, 109, 255, 0.15);
    transform: translateY(-4px);
}

.trust-number {
    font-size: 24px;
    font-weight: 600;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    line-height: 1.2;
}

.trust-label {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.trust-desc {
    font-size: 13px;
    color: var(--text-light);
}

/* 首屏内嵌品牌墙 */
.hero-brand-wall {
    margin-top: 100px;
    width: 100vw;
    margin-left: calc(-50vw + 50%);
    overflow: hidden;
}

.hero-brand-title {
    font-size: 24px;
    font-weight: 500;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 30px;
}

.hero-brand-scroll {
    position: relative;
    width: 100%;
    overflow: hidden;
    mask-image: linear-gradient(to right, transparent, black 5%, black 95%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 5%, black 95%, transparent);
}

.hero-brand-track {
    display: flex;
    gap: 24px;
    animation: scroll 40s linear infinite;
    width: max-content;
}

.hero-brand-track .brand-item {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(50, 109, 255, 0.08);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.hero-brand-track .brand-item img {
    max-height: 28px;
}

.hero-brand-track .brand-item:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
}

/* ================================
   品牌墙 Brand Wall (独立section - 备用)
   ================================ */
.brand-wall {
    padding: 60px 0;
    background: var(--bg-light);
    overflow: hidden;
}

.brand-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 40px;
}

.brand-scroll-container {
    position: relative;
    width: 100%;
    overflow: hidden;
    mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.brand-scroll-track {
    display: flex;
    gap: 60px;
    animation: scroll 30s linear infinite;
    width: max-content;
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.brand-item {
    flex-shrink: 0;
    padding: 12px 16px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-item img {
    max-height: 36px;
    width: auto;
    object-fit: contain;
}

.brand-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* ================================
   产品特色功能 Features Section
   ================================ */
.features {
    padding: 100px 20px;
    background: var(--bg-white);
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 60px;
}

/* Tab 导航 */
.feature-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 48px;
}

.feature-tab {
    padding: 14px 24px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-gray);
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.feature-tab:hover {
    color: var(--primary-color);
    border-color: var(--primary-light);
    background: rgba(50, 109, 255, 0.05);
}

.feature-tab.active {
    color: var(--bg-white);
    background: var(--primary-gradient);
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

/* Tab 内容 */
.feature-contents {
    position: relative;
}

.feature-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.feature-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Feature 卡片 */
.feature-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: 60px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

/* 卡片微光效果 */
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(50, 109, 255, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.feature-text {
    position: relative;
    z-index: 1;
}

.feature-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    line-height: 1.3;
}

.feature-subtitle {
    font-size: 16px;
    color: var(--text-gray);
    margin-bottom: 32px;
    line-height: 1.7;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    margin-bottom: 24px;
    padding-left: 28px;
    position: relative;
}

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 6px;
    width: 16px;
    height: 16px;
    background: var(--primary-gradient);
    border-radius: 50%;
    opacity: 0.8;
}

.feature-list li strong {
    display: block;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.feature-list li span {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* Feature 视觉区域 */
.feature-visual {
    position: relative;
    z-index: 1;
}

.feature-img {
    width: 100%;
    height: auto;
}

/* ================================
   行业最佳解决方案 Solutions Section
   ================================ */
.solutions {
    padding: 100px 20px;
    background: var(--bg-light);
}

.solutions-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    text-align: center;
    margin-top: -40px;
    margin-bottom: 48px;
}

/* 解决方案 Tab 导航 */
.solution-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 48px;
}

.solution-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-gray);
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.solution-tab .tab-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.solution-tab:hover {
    color: var(--primary-color);
    border-color: var(--primary-light);
    background: rgba(50, 109, 255, 0.05);
}

.solution-tab.active {
    color: var(--bg-white);
    background: var(--primary-gradient);
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

.solution-tab.active .tab-icon {
    stroke: var(--bg-white);
}

/* 解决方案内容 */
.solution-contents {
    position: relative;
}

.solution-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.solution-content.active {
    display: block;
}

/* 解决方案卡片网格 - 6列布局 */
.solution-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.solution-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.solution-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
    border-color: rgba(50, 109, 255, 0.2);
}

.solution-card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0 0 16px 0;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-light);
}

.solution-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.solution-list li {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.solution-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
}

/* 获取解决方案按钮 */
.solution-cta {
    text-align: center;
    margin-top: 60px;
}

.solution-cta-button {
    display: inline-block;
    padding: 18px 72px;
    font-size: 18px;
    font-weight: 600;
    color: var(--bg-white);
    background: var(--primary-gradient);
    border: none;
    border-radius: 50px;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md), var(--glow);
}

.solution-cta-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(50, 109, 255, 0.3);
}

/* ================================
   客户成功案例 Cases Section
   ================================ */
.cases {
    padding: 100px 20px;
    background: var(--bg-white);
}

.cases-container {
    max-width: 1200px;
    margin: 0 auto;
}

.cases-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 20px;
}

.cases-nav {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 2px solid var(--primary-color);
    background: var(--bg-white);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 10;
    box-shadow: 0 4px 15px rgba(50, 109, 255, 0.15);
}

.cases-nav:hover {
    background: var(--primary-gradient);
    border-color: transparent;
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(50, 109, 255, 0.25);
}

.cases-nav:hover svg {
    stroke: #ffffff;
}

.cases-nav svg {
    width: 22px;
    height: 22px;
    stroke: var(--primary-color);
    stroke-width: 2.5;
}

.cases-nav:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    border-color: var(--border-color);
    box-shadow: none;
}

.cases-nav:disabled svg {
    stroke: var(--text-light);
}

.cases-scroll {
    flex: 1;
    overflow: hidden;
}

.cases-track {
    display: flex;
    gap: 24px;
    transition: transform 0.4s ease;
}

.case-card {
    flex-shrink: 0;
    width: 380px;
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: 28px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(50, 109, 255, 0.08);
    transition: var(--transition);
}

.case-card:hover {
    box-shadow: 0 12px 40px rgba(50, 109, 255, 0.15), 0 4px 12px rgba(0, 0, 0, 0.08);
    border-color: rgba(50, 109, 255, 0.2);
    transform: translateY(-6px);
}

.case-logo-img {
    margin-bottom: 16px;
    padding: 16px;
    background: var(--bg-light);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60px;
}

.case-logo-img img {
    max-width: 100%;
    max-height: 40px;
    object-fit: contain;
}

.case-header {
    margin-bottom: 12px;
}

.case-industry {
    display: inline-block;
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 500;
    color: var(--primary-color);
    background: rgba(50, 109, 255, 0.08);
    border-radius: 20px;
}

.case-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.5;
    margin-bottom: 10px;
}

.case-scene {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 16px;
}

.case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.case-tags span {
    padding: 4px 10px;
    font-size: 11px;
    color: var(--text-gray);
    background: var(--bg-light);
    border-radius: 12px;
}

.case-results {
    padding: 16px;
    background: var(--bg-light);
    border-radius: var(--border-radius);
}

.case-results h5 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.case-results ul {
    list-style: none;
}

.case-results li {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
    padding-left: 16px;
    position: relative;
    margin-bottom: 8px;
}

.case-results li:last-child {
    margin-bottom: 0;
}

.case-results li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
}

.case-results li strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* ================================
   四位一体陪跑支持体系 Support Section
   ================================ */
.support {
    padding: 100px 20px;
    background: linear-gradient(180deg, var(--bg-light) 0%, #f0f4ff 100%);
}

.support-container {
    max-width: 1200px;
    margin: 0 auto;
}

.support-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
}

/* 连接线 - 更粗，位于卡片垂直中间 */
.support-grid::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 12.5%;
    right: 12.5%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-light), var(--primary-color), var(--primary-light));
    z-index: 0;
    transform: translateY(-50%);
    border-radius: 2px;
    box-shadow: 0 2px 8px rgba(50, 109, 255, 0.3);
}

.support-card {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: 32px 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    z-index: 1;
}

.support-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

/* 新增：标题区域布局 - 图标和标题横向排列 */
.support-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.support-header-text {
    flex: 1;
}

.support-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-gradient);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.support-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--bg-white);
}

.support-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 4px 0;
}

.support-subtitle {
    font-size: 13px;
    color: var(--text-light);
    margin: 0;
}

.support-audience {
    font-size: 13px;
    color: var(--text-gray);
    padding: 10px 14px;
    background: var(--bg-light);
    border-radius: 8px;
    margin-bottom: 20px;
}

.support-audience span {
    font-weight: 600;
    color: var(--text-dark);
}

.support-list {
    list-style: none;
}

.support-list li {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 12px;
    padding-left: 0;
}

.support-list li:last-child {
    margin-bottom: 0;
}

.support-list li strong {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 2px;
}

/* ================================
   页面底部 CTA Footer CTA Section
   ================================ */
.footer-cta {
    padding: 80px 20px;
    background: var(--primary-gradient);
    text-align: center;
}

.footer-cta-container {
    max-width: 800px;
    margin: 0 auto;
}

.footer-slogan {
    font-size: 32px;
    font-weight: 700;
    color: var(--bg-white);
    margin-bottom: 32px;
    line-height: 1.4;
}

.footer-cta-button {
    display: inline-block;
    padding: 18px 72px;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
    background: var(--bg-white);
    border: none;
    border-radius: 50px;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.footer-cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

/* ================================
   响应式设计
   ================================ */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 40px;
    }

    .feature-card {
        grid-template-columns: 1fr;
        padding: 40px;
    }

    .feature-visual {
        order: -1;
    }

    .feature-placeholder {
        height: 300px;
    }

    .solution-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .support-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .support-grid::before {
        display: none;
    }

    .case-card {
        width: 320px;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 100px 20px 40px;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 20px;
    }

    .hero-description {
        font-size: 16px;
    }

    /* 移动端减少背景特效 */
    .hero-lines {
        opacity: 0.4;
    }

    .hero-particles span:nth-child(n+6) {
        display: none;
    }

    .cta-button {
        padding: 16px 60px;
        font-size: 18px;
    }

    .trust-badges {
        flex-direction: column;
        gap: 16px;
    }

    .trust-card {
        padding: 24px 32px;
        min-width: auto;
        width: 100%;
    }

    .trust-number {
        font-size: 32px;
    }

    .hero-brand-wall {
        margin-top: 32px;
    }

    .hero-brand-title {
        font-size: 13px;
        margin-bottom: 16px;
    }

    .hero-brand-track {
        gap: 16px;
    }

    .hero-brand-track .brand-item img {
        max-height: 24px;
    }

    .feature-tabs {
        flex-direction: column;
        align-items: stretch;
    }

    .feature-tab {
        text-align: center;
    }

    .section-title {
        font-size: 28px;
    }

    .feature-title {
        font-size: 24px;
    }

    .scenario-tabs {
        flex-direction: column;
        align-items: stretch;
    }

    .scenario-tab {
        justify-content: center;
    }

    .scenario-cards {
        grid-template-columns: 1fr;
    }

    .section-subtitle {
        margin-top: -30px;
        font-size: 16px;
    }

    /* Solutions 响应式 */
    .solution-tabs {
        flex-direction: column;
        align-items: stretch;
    }

    .solution-tab {
        justify-content: center;
    }

    .solution-grid {
        grid-template-columns: 1fr;
    }

    .solution-cta-button {
        padding: 16px 48px;
        font-size: 16px;
    }

    /* Cases 响应式 */
    .cases {
        padding: 60px 20px;
    }

    .cases-nav {
        width: 40px;
        height: 40px;
    }

    .case-card {
        width: 280px;
        padding: 20px;
    }

    .case-logo {
        font-size: 18px;
    }

    .case-title {
        font-size: 15px;
    }

    /* Support 响应式 */
    .support {
        padding: 60px 20px;
    }

    .support-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .support-card {
        padding: 24px 20px;
    }

    /* Footer CTA 响应式 */
    .footer-cta {
        padding: 60px 20px;
    }

    .footer-slogan {
        font-size: 24px;
    }

    .footer-cta-button {
        padding: 16px 48px;
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 26px;
    }

    .logo {
        height: 36px;
    }

    .cta-button {
        padding: 14px 48px;
        font-size: 16px;
        width: 100%;
        max-width: 280px;
    }

    .trust-number {
        font-size: 28px;
    }

    .feature-card {
        padding: 24px;
    }

    /* Cases 响应式 */
    .cases-wrapper {
        gap: 12px;
    }

    .cases-nav {
        width: 36px;
        height: 36px;
    }

    .cases-nav svg {
        width: 16px;
        height: 16px;
    }

    .case-card {
        width: 260px;
        padding: 18px;
    }

    .case-industry {
        font-size: 11px;
        padding: 4px 10px;
    }

    .case-logo {
        font-size: 16px;
    }

    .case-title {
        font-size: 14px;
    }

    .case-scene {
        font-size: 12px;
    }

    .case-results {
        padding: 12px;
    }

    .case-results h5 {
        font-size: 12px;
    }

    .case-results li {
        font-size: 12px;
    }

    /* Support 响应式 */
    .support-icon {
        width: 48px;
        height: 48px;
    }

    .support-icon svg {
        width: 24px;
        height: 24px;
    }

    .support-title {
        font-size: 16px;
    }

    /* Footer CTA 响应式 */
    .footer-slogan {
        font-size: 20px;
    }

    .footer-cta-button {
        padding: 14px 36px;
        font-size: 15px;
        width: 100%;
        max-width: 280px;
    }
}